Tool 03 · Payback

Solar payback calculator — break-even year

Enter net system cost and expected monthly savings. See simple payback, 25-year gross savings and the point where the math starts working.

Inputscost + savings

Outputbreak-even year

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Compare quote $/W

Net system cost after incentives ($) Expected monthly bill savings ($) Annual maintenance / insurance allowance ($)

Simple payback is not the whole investment

This is intentionally simple: net cost divided by yearly savings after any maintenance allowance. It does not model loan dealer fees, panel degradation, utility rate inflation or resale value.

If an installer gave you a cash price and system size, run the quote scorecard next. A payback projection is only believable when the $/W is sane.